Communication device adopted for multi-input multi-output orthogonal frequency division multiplexing system and method thereof

Active Publication Date: 2011-05-26
ARCADYAN
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[0009]An objective of the present invention is to provide a communication device adopted for a multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) system and a method thereof. The communication device only needs to perform singular value decomposition (SVD) operations on channel matrices of selected subcarriers to obtain SVD matrices, and then perform i

Problems solved by technology

However, the number of subcarriers is usually relatively large, so performing SVD operations on channel matr

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  • Communication device adopted for multi-input multi-output orthogonal frequency division multiplexing system and method thereof
  • Communication device adopted for multi-input multi-output orthogonal frequency division multiplexing system and method thereof
  • Communication device adopted for multi-input multi-output orthogonal frequency division multiplexing system and method thereof

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[0047]It shall be particularly noted that, as described in the first embodiment, depending on distances (d) from the third subcarrier to the first subcarrier and the second subcarrier, the third beamforming matrix may also be obtained by performing a matrix multiplication operation on the second beamforming matrix 310 and the beamforming phase rotation matrix, and the third decoding matrix may also be obtained by perform a matrix multiplication operation on the second decoding matrix 314 and the decoding phase rotation matrix. Furthermore, the approaches to obtain the beamforming phase rotation matrix and the decoding phase rotation matrix in the present invention are not merely limited to what shown in Equations 4 and 7; rather, in other embodiments, other interpolation approaches may also be used to obtain the beamforming phase rotation matrix and the decoding phase rotation matrix. Based on the technical disclosures described in the present invention, those of ordinary skill in t...

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Abstract

A communication device adopted for a multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) system and a method thereof are provided. The MIMO-OFDM system comprises the communication device and a corresponding communication device, and they communicate with each other. The communication device comprises a transceiving module, a singular value decomposition (SVD) operation module, and an interpolation operation module. The transceiving module receives a channel state information (CSI) from the corresponding communication device, wherein the CSI comprises CSIs of a plurality of selected subcarriers. For each of the selected subcarriers, the SVD module performs an SVD decomposition operation on the channel matrix representing the CSI of the selected subcarrier to obtain a decomposed result, wherein the decomposed result comprises a beamforming matrix, an SVD matrix, and a decoding matrix. The interpolation operation module performs interpolations on the beamforming matrices of the selected subcarriers to derive beamforming matrices of the unselected subcarriers. The interpolation operation module performs interpolations on the decoding matrixes of the selected subcarriers to derive obtain decoding matrices of the unselected subcarriers.

Description

[0001]This application claims priority to Taiwan Patent Application No. 098140120 filed on Nov. 25, 2009.CROSS-REFERENCES TO RELATED APPLICATIONS[0002]Not applicable.BACKGROUND OF THE INVENTION[0003]1. Field of the Invention[0004]The present invention relates to a communication device adopted for a multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) system and a method thereof. More particularly, the communication device and the method thereof of the present invention utilize interpolation operations to reduce the number of singular value decomposition (SVD) operations performed on channel matrices in the MIMO-OFDM system.[0005]2. Descriptions of the Related Art[0006]As wireless communication technologies evolve, demands on quality and traffic of communication become ever higher. Nowadays, the multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) system has become one of the mainstream systems in the wireless communication sector...

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Application Information

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IPC IPC(8): H04B7/02
CPCH04B7/0617H04B7/0434
Inventor SANG, TZU-HSIENCHANG, YU-JEN
Owner ARCADYAN
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